| Opelika to Opwijk | 4,488.20 mi (7,223.05 km) |
| Opelika to Ostend | 4,430.59 mi (7,130.35 km) |
| Opelika to Oud-Heverlee | 4,511.18 mi (7,260.04 km) |
| Opelika to Oud-Turnhout | 4,511.36 mi (7,260.34 km) |
| Opelika to Oudenaarde | 4,467.51 mi (7,189.77 km) |
| Opelika to Oudenburg | 4,434.90 mi (7,137.28 km) |
| Opelika to Oupeye | 4,553.91 mi (7,328.81 km) |
| Opelika to Overijse | 4,507.08 mi (7,253.44 km) |
| Opelika to Overpelt | 4,531.32 mi (7,292.46 km) |
| Opelika to Paal | 4,526.21 mi (7,284.23 km) |
| Opelika to Peer | 4,535.01 mi (7,298.40 km) |
| Opelika to Pepinster | 4,564.72 mi (7,346.21 km) |
| Opelika to Peruwelz | 4,475.24 mi (7,202.21 km) |
| Opelika to Perwez | 4,522.64 mi (7,278.48 km) |
| Opelika to Philippeville | 4,522.94 mi (7,278.97 km) |
